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Steam pretreatment of acid-sprayed and acid-soaked barley straw for production of ethanol

Linde, Marie LU ; Galbe, Mats LU and Zacchi, Guido LU (2006) In Applied Biochemistry and Biotechnology 130(1-3). p.546-562
Abstract
Barley is an abundant crop in Europe, which makes its straw residues an interesting cellulose source for ethanol production. Steam pretreatment of the straw followed by enzymatic hydrolysis converts the cellulose to fermentable sugars. Prior to pretreatment the material is impregnated with a catalyst, for example, H2SO4, to enhance enzymatic digestibility of the pretreated straw. Different impregnation techniques can be applied. In this study, soaking and spraying were investigated and compared at the same pretreatment condition in terms of overall yield of glucose and xylose. The overall yield includes the soluble sugars in the liquid from pretreatment, including soluble oligomers, and monomer sugars obtained in the enzymatic hydrolysis.... (More)
Barley is an abundant crop in Europe, which makes its straw residues an interesting cellulose source for ethanol production. Steam pretreatment of the straw followed by enzymatic hydrolysis converts the cellulose to fermentable sugars. Prior to pretreatment the material is impregnated with a catalyst, for example, H2SO4, to enhance enzymatic digestibility of the pretreated straw. Different impregnation techniques can be applied. In this study, soaking and spraying were investigated and compared at the same pretreatment condition in terms of overall yield of glucose and xylose. The overall yield includes the soluble sugars in the liquid from pretreatment, including soluble oligomers, and monomer sugars obtained in the enzymatic hydrolysis. The yields obtained differed for the impregnation techniques. Acid-soaked barley straw gave the highest overall yield of glucose, regardless of impregnation time (10 or 30 min) or acid concentration (0.2 or 1.0 wt%). For xylose, soaking gave the highest overall yield at 0.2 wt% H2SO4. An increase in acid concentration resulted in a decrease in xylose yield for both acid-soaked and acid-sprayed barley straw. Optimization of the pretreatment conditions for acid-sprayed barley straw was performed to obtain yields using spraying that were as high as those with soaking. For acid-sprayed barley straw the optimum pretreatment condition for glucose, 1.0 wt% H2SO4 and 220 degrees C for 5 min, gave an overall glucose yield of 92% of theoretical based on the composition of the raw material. Pretreatment with 0.2 wt% H2SO4 at 190 degrees C for 5 min resulted in the highest overall xylose yield, 67% of theoretical based on the composition of the raw material. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
enzymatic hydrolysis, barley straw, pretreatment, ethanol, H2SO4
in
Applied Biochemistry and Biotechnology
volume
130
issue
1-3
pages
546 - 562
publisher
Humana Press
external identifiers
  • wos:000203004900018
  • scopus:33646925201
ISSN
1559-0291
language
English
LU publication?
yes
id
110c4f8d-8eea-43af-acfb-91153fbf2012 (old id 1410569)
date added to LUP
2016-04-01 12:24:21
date last changed
2021-09-15 01:47:36
@article{110c4f8d-8eea-43af-acfb-91153fbf2012,
  abstract     = {Barley is an abundant crop in Europe, which makes its straw residues an interesting cellulose source for ethanol production. Steam pretreatment of the straw followed by enzymatic hydrolysis converts the cellulose to fermentable sugars. Prior to pretreatment the material is impregnated with a catalyst, for example, H2SO4, to enhance enzymatic digestibility of the pretreated straw. Different impregnation techniques can be applied. In this study, soaking and spraying were investigated and compared at the same pretreatment condition in terms of overall yield of glucose and xylose. The overall yield includes the soluble sugars in the liquid from pretreatment, including soluble oligomers, and monomer sugars obtained in the enzymatic hydrolysis. The yields obtained differed for the impregnation techniques. Acid-soaked barley straw gave the highest overall yield of glucose, regardless of impregnation time (10 or 30 min) or acid concentration (0.2 or 1.0 wt%). For xylose, soaking gave the highest overall yield at 0.2 wt% H2SO4. An increase in acid concentration resulted in a decrease in xylose yield for both acid-soaked and acid-sprayed barley straw. Optimization of the pretreatment conditions for acid-sprayed barley straw was performed to obtain yields using spraying that were as high as those with soaking. For acid-sprayed barley straw the optimum pretreatment condition for glucose, 1.0 wt% H2SO4 and 220 degrees C for 5 min, gave an overall glucose yield of 92% of theoretical based on the composition of the raw material. Pretreatment with 0.2 wt% H2SO4 at 190 degrees C for 5 min resulted in the highest overall xylose yield, 67% of theoretical based on the composition of the raw material.},
  author       = {Linde, Marie and Galbe, Mats and Zacchi, Guido},
  issn         = {1559-0291},
  language     = {eng},
  number       = {1-3},
  pages        = {546--562},
  publisher    = {Humana Press},
  series       = {Applied Biochemistry and Biotechnology},
  title        = {Steam pretreatment of acid-sprayed and acid-soaked barley straw for production of ethanol},
  volume       = {130},
  year         = {2006},
}